Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1ſimiliter demonſtrabitur totius priſmatis aK grauitatis ef
ſe centrum.
Simili ratione & in aliis priſmatibus illud
idem facile demonſtrabitur.
Quo autem pacto in omni
figura rectilinea centrum grauitatis inueniatur, docuimus
in commentariis in ſextam propoſitionem Archimedis de
quadratura parabolæ.
Sit cylindrus, uel cylindri portio ce cuius axis ab: ſece­
turque plano per axem ducto; quod ſectionem faciat paral­
lelogrammum cdef: & diuiſis cf, de bifariam in punctis
26[Figure 26]
gh, per ea ducatur planum baſi æquidiſtans.
erit ſectio gh
circulus, uel ellipſis, centrum habens in axe; quod ſit K at­

que erunt ex iis, quæ demonſtrauimus, centra grauitatis
planorum oppoſitorum puncta ab: & plani gh ipſum k in
quo quidem plano eſt centrum grauitatis cylindri, uel cy­
lindri portionis.
Dico punctum K cylindri quoque, uel cy
lindri portionis grauitatis centrum eſſe.
Si enim fieri po­
teſt, ſit l centrum: ducaturque kl, & extra figuram in m pro­
ducatur.
quam ucro proportionem habet linea mK ad kl

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